In the Instant Pot, use the saute setting and combine the chicken, oil and garlic.
Brown the chicken for 2-3 minutes on each side, then add in the curry, black pepper, chili powder, onions, dry basil, cardamom, and grated ginger.
Stir the chicken to distribute the spices evenly, then turn OFF the saute function.
Pour in the coconut milk, and add the top to the Instant Pot.
Close the lid, seal the valve and set the timer for manual (high) and 5 minutes.
Once the pot beeps, remove 1/4 C. of the liquid and combine with the tapioca flour/starch - mix until blended.
Pour that mixture back into the pot and stir to distribute evenly.
Let the mixture stand for 2-3 minutes to thicken, add the cilantro and salt and stir to combine. Serve over rice.